蹬鼻子上脸

dēng bí zi shàng liǎn

lit. to climb all over sb

fig. to take advantage of sb's weakness

dēng

to step on; to tread on

nose

zi

noun suffix, as in 椅子[yi3 zi5] "chair"

shàng

(bound form) up; upper; above; previous

liǎn

face